Which criterion for supporting material is related to using a variety of types of evidence in a speech?

The criterion related to using a variety of types of evidence in a speech is rooted in the importance of diversity in supporting material, which enhances the overall effectiveness and engagement of the presentation. By incorporating various types of evidence—such as statistics, anecdotes, expert testimonials, and examples—speakers can appeal to different senses and learning styles, making their arguments more compelling and memorable.

Using a variety of evidence helps to capture the audience's attention and keeps them engaged throughout the speech. It also lends credibility to the speaker's arguments, as it demonstrates thorough research and understanding of the topic. When audiences hear information presented in multiple formats, they are more likely to find the content relatable and convincing, leading to a stronger impact overall.

In contrast, simply relying on one type of evidence can lead to a lack of engagement or perceived bias, as the information may not resonate with everyone in the audience. Therefore, emphasizing variety in supporting material is crucial for a well-rounded and effective speech.